Nickel-Zinc rechargeable battery info ??

[1enry1]

hi to all... sorry that there is a post open for this ....

Does anyone have experience on "rechargeable" batteries with Nickel-Zinc Technology at 1.6 volts?

I have several brands but I know they have all the same problem!

I use 4 series, and always downloads one while the other 3 are still almost charged, but in this way where the use gives me the
Signaling of discharged batteries or to change, serious!

But as defect of this 1.6-volt rechargeable batteries technology or?

Thank you

 

[Lynx_Arc]

The issue of uneven discharging and overdischarging batteries in series is common and if the batteries are charged in series other issues abound. The reasons for cells to discharge to a lower voltage in a set in series is first usually one battery has lower capacity (total energy) than the others in the set and when the amount of current (mah) of that battery is depleted from the whole set the others which have a higher state of mah from the start are not depleted the cell that is goes into lower and lower voltage under load and sometimes it will actually hit 0 volts or be even reversed charged, that is the + and - ends of the battery will measure the opposite polarities on a meter. Another reason is sometimes one battery is nearer to a heat source than the others and the higher temp of that battery causes it to discharge at a different rate (often higher). Uneven discharge of cells can be related to internal resistance of each battery it can affect how much power the battery will supply under a load.

For these reasons I've all but abandoned 1.5v chemistries in devices that require multiple batteries in series vs single or parallel sets of lithium ion batteries.

Charging in series of batteries is also a problem with 1.5v chemistries as many cheap chargers require 2 batteries in series to charge and unless the batteries are both matched in capacity, internal resistance, and state of charge when they are recharged in series often one battery will complete charging before the other and will end up being overcharged waiting for the other battery to complete charging.

NiZn rechargeables were once the big thing but invariably people who use them tire of their short life and abandon them for eneloops or lithium ion based devices. If they could manage to make the chemistry and batteries even half as robust as eneloops likely more folks would accept the fragility and lower charge cycles of them.

As someone that has once used RAM (rechargeable alkaline maganese) batteries that each time they were recharged the capacity dropped significantly after about 20-30 cycles or so they were at about 1/4 of original capacity and mine got to where they were likely about 10% or less capacity. I had an LED light rated at about 20 hours that got about 12+ hours off them when they were new but when I finally pitched them they were down to about 20 minutes runtime and I don't think I got even 40 recharge cycles from them and the last 10-15 were short lived running a few hours or less on a charge.

IMO NiZn are not a good investment for most devices and people.